Answer: Marine heat waves
Notes: In April, ocean temperatures soared to 21.1 degrees Celsius, breaking the previous record set in 2016. Since then, these record-high ocean temperatures have led to marine heat waves in various regions, including the north-east Pacific, the southern Indian Ocean, the Pacific etc. A marine heat wave is an extreme weather event characterized by the sea surface temperature rising 3 to 4 degrees Celsius above the average temperature for at least five days and can last for weeks.
